|2016-04-12||OTHER||Siemens SCALANCE , ROX||Siemens||N/A||2016-0800||N/A||N/A||N/A|
# Siemens Industrial Products DROWN Vulnerability
Siemens has found that a DROWN (Decrypting RSA with Obsolete and Weakened eNcryption) attack can affect some Siemens industrial products under certain conditions. Siemens recommends specific countermeasures until patches are available.
This vulnerability could be exploited remotely. Exploits that target this vulnerability are known to be publicly available.
### AFFECTED PRODUCTS
Siemens reports that the vulnerability may affect the following products:
SCALANCE X300 family: All versions,
SCALANCE X414: All versions,
SCALANCE X200 IRT family: All versions,
SCALANCE X200 RNA family: All versions,
SCALANCE X200 family: All versions, and
ROX I: All versions.
An attacker in a privileged network position could use this vulnerability to intercept transport layer security sessions.
Impact to individual organizations depends on many factors that are unique to each organization.
Siemens is a multinational company headquartered in Munich, Germany.
SCALANCE-X switches are used to connect industrial components like PLCs or HMIs. Siemens RuggedCom ROX-based VPN endpoints and firewall devices are used to connect devices that operate in harsh environments such as electric utility substations and traffic control cabinets.
According to Siemens, these devices are deployed across most sectors including Chemical, Communications, Critical Manufacturing, Dams, Defense Industrial Base, Energy, Food and Agriculture, Government Facilities, Transportation Systems, and Water and Wastewater Systems. Siemens estimates that these products are used worldwide.
### VULNERABILITY CHARACTERIZATION
# VULNERABILITY OVERVIEW
A cross-protocol attack was discovered that could allow an attacker to decrypt intercepted TLS sessions by using a server supporting SSLv2 as a Bleichenbacher RSA padding oracle.
CVE-2016-0800 has been assigned to this vulnerability. A CVSS v3 base score of 4.0 has been calculated; the CVSS vector string is (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N).
### VULNERABILITY DETAILS
This vulnerability could be exploited remotely.
# EXISTENCE OF EXPLOIT
Exploits that target this vulnerability are publicly available.
Crafting a working exploit for this vulnerability would be difficult.
Siemens recommends that users apply the following mitigations until patches are available:
* Protect network access to the web server (443/TCP, 10000/TCP for ROX I by default) on the devices with appropriate mechanisms.
* Restrict access to management interface to internal network.
* Apply defense-in-depth.
As a general security measure, Siemens strongly recommends to protect network access to nonperimeter devices with appropriate mechanisms. It is advised to configure the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment.
https://www.siemens.com/cert/operational-guidelines-industrial-security(link is external)
For more information on these vulnerabilities and detailed instructions, please see Siemens Security Advisory SSA-623229 at the following location: